git://gcc.gnu.org / gcc.git / blame
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|---|---|---|
| cacbc350 RK |
1 | ------------------------------------------------------------------------------ |
| 2 | -- -- | |
| 3 | -- GNAT RUNTIME COMPONENTS -- | |
| 4 | -- -- | |
| 5 | -- S Y S T E M . W C H _ W T S -- | |
| 6 | -- -- | |
| 7 | -- B o d y -- | |
| 8 | -- -- | |
| cacbc350 RK |
9 | -- Copyright (C) 1992-2000 Free Software Foundation, Inc. -- |
| 10 | -- -- | |
| 11 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 12 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 13 | -- ware Foundation; either version 2, or (at your option) any later ver- -- | |
| 14 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 16 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- | |
| 17 | -- for more details. You should have received a copy of the GNU General -- | |
| 18 | -- Public License distributed with GNAT; see file COPYING. If not, write -- | |
| 19 | -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- | |
| 20 | -- MA 02111-1307, USA. -- | |
| 21 | -- -- | |
| 22 | -- As a special exception, if other files instantiate generics from this -- | |
| 23 | -- unit, or you link this unit with other files to produce an executable, -- | |
| 24 | -- this unit does not by itself cause the resulting executable to be -- | |
| 25 | -- covered by the GNU General Public License. This exception does not -- | |
| 26 | -- however invalidate any other reasons why the executable file might be -- | |
| 27 | -- covered by the GNU Public License. -- | |
| 28 | -- -- | |
| 29 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 71ff80dc | 30 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| cacbc350 RK |
31 | -- -- |
| 32 | ------------------------------------------------------------------------------ | |
| 33 | ||
| 34 | with Interfaces; use Interfaces; | |
| 35 | with System.WCh_Con; use System.WCh_Con; | |
| 36 | with System.WCh_JIS; use System.WCh_JIS; | |
| 37 | ||
| 38 | package body System.WCh_WtS is | |
| 39 | ||
| 40 | --------------------------- | |
| 41 | -- Wide_String_To_String -- | |
| 42 | --------------------------- | |
| 43 | ||
| 44 | function Wide_String_To_String | |
| 45 | (S : Wide_String; | |
| 46 | EM : WC_Encoding_Method) | |
| 47 | return String | |
| 48 | is | |
| 49 | R : String (1 .. 5 * S'Length); -- worst case length! | |
| 50 | RP : Natural; | |
| 51 | C1 : Character; | |
| 52 | C2 : Character; | |
| 53 | ||
| 54 | begin | |
| 55 | RP := 0; | |
| 56 | ||
| 57 | for SP in S'Range loop | |
| 58 | declare | |
| 59 | C : constant Wide_Character := S (SP); | |
| 60 | CV : constant Unsigned_16 := Wide_Character'Pos (C); | |
| 61 | Hex : constant array (Unsigned_16 range 0 .. 15) of Character := | |
| 62 | "0123456789ABCDEF"; | |
| 63 | ||
| 64 | begin | |
| 65 | if CV <= 127 then | |
| 66 | RP := RP + 1; | |
| 67 | R (RP) := Character'Val (CV); | |
| 68 | ||
| 69 | else | |
| 70 | case EM is | |
| 71 | ||
| 72 | -- Hex ESC sequence encoding | |
| 73 | ||
| 74 | when WCEM_Hex => | |
| 75 | if CV <= 16#FF# then | |
| 76 | RP := RP + 1; | |
| 77 | R (RP) := Character'Val (CV); | |
| 78 | ||
| 79 | else | |
| 80 | R (RP + 1) := ASCII.ESC; | |
| 81 | R (RP + 2) := Hex (Shift_Right (CV, 12)); | |
| 82 | R (RP + 3) := Hex (Shift_Right (CV, 8) and 16#000F#); | |
| 83 | R (RP + 4) := Hex (Shift_Right (CV, 4) and 16#000F#); | |
| 84 | R (RP + 5) := Hex (CV and 16#000F#); | |
| 85 | RP := RP + 5; | |
| 86 | end if; | |
| 87 | ||
| 88 | -- Upper bit shift (internal code = external code) | |
| 89 | ||
| 90 | when WCEM_Upper => | |
| 91 | R (RP + 1) := Character'Val (Shift_Right (CV, 8)); | |
| 92 | R (RP + 2) := Character'Val (CV and 16#FF#); | |
| 93 | RP := RP + 2; | |
| 94 | ||
| 95 | -- Upper bit shift (EUC) | |
| 96 | ||
| 97 | when WCEM_EUC => | |
| 98 | JIS_To_EUC (C, C1, C2); | |
| 99 | R (RP + 1) := C1; | |
| 100 | R (RP + 2) := C2; | |
| 101 | RP := RP + 2; | |
| 102 | ||
| 103 | -- Upper bit shift (Shift-JIS) | |
| 104 | ||
| 105 | when WCEM_Shift_JIS => | |
| 106 | JIS_To_Shift_JIS (C, C1, C2); | |
| 107 | R (RP + 1) := C1; | |
| 108 | R (RP + 2) := C2; | |
| 109 | RP := RP + 2; | |
| 110 | ||
| 111 | -- Upper bit shift (UTF-8) | |
| 112 | ||
| 113 | -- 16#0080#-16#07ff#: 2#110xxxxx# 2#10xxxxxx# | |
| 114 | -- 16#0800#-16#ffff#: 2#1110xxxx# 2#10xxxxxx# 2#10xxxxxx# | |
| 115 | ||
| 116 | when WCEM_UTF8 => | |
| 117 | if CV < 16#0800# then | |
| 118 | R (RP + 1) := | |
| 119 | Character'Val (2#11000000# or Shift_Right (CV, 6)); | |
| 120 | R (RP + 2) := | |
| 121 | Character'Val (2#10000000# or (CV and 2#00111111#)); | |
| 122 | RP := RP + 2; | |
| 123 | ||
| 124 | else | |
| 125 | R (RP + 1) := | |
| 126 | Character'Val (2#11100000# or Shift_Right (CV, 12)); | |
| 127 | R (RP + 2) := | |
| 128 | Character'Val (2#10000000# or | |
| 129 | (Shift_Right (CV, 6) and | |
| 130 | 2#00111111#)); | |
| 131 | R (RP + 3) := | |
| 132 | Character'Val (2#10000000# or (CV and 2#00111111#)); | |
| 133 | RP := RP + 3; | |
| 134 | end if; | |
| 135 | ||
| 136 | -- Brackets encoding | |
| 137 | ||
| 138 | when WCEM_Brackets => | |
| 139 | if CV <= 16#FF# then | |
| 140 | RP := RP + 1; | |
| 141 | R (RP) := Character'Val (CV); | |
| 142 | ||
| 143 | else | |
| 144 | R (RP + 1) := '['; | |
| 145 | R (RP + 2) := '"'; | |
| 146 | R (RP + 3) := Hex (Shift_Right (CV, 12)); | |
| 147 | R (RP + 4) := Hex (Shift_Right (CV, 8) and 16#000F#); | |
| 148 | R (RP + 5) := Hex (Shift_Right (CV, 4) and 16#000F#); | |
| 149 | R (RP + 6) := Hex (CV and 16#000F#); | |
| 150 | R (RP + 7) := '"'; | |
| 151 | R (RP + 8) := ']'; | |
| 152 | RP := RP + 8; | |
| 153 | end if; | |
| 154 | ||
| 155 | end case; | |
| 156 | end if; | |
| 157 | end; | |
| 158 | end loop; | |
| 159 | ||
| 160 | return R (1 .. RP); | |
| 161 | end Wide_String_To_String; | |
| 162 | ||
| 163 | end System.WCh_WtS; |